These images are breathtaking. It amazes me how waterfalls are formed.

Waterfalls form when a river is young. At this stage the channel is usually narrow and deep.When the river courses over resistant bedrock, erosion happens slowly and soon speeds up. As the watercourse increases its velocity at the edge of the waterfall, it drags material from the riverbed. Whirlpools created in the turbulence as well as sand and stones carried by the watercourse increase the erosion.This causes the waterfall to carve deeper into the bed and to recede upstream.